ObjectSpace::WeakKeyMap#clear

static VALUE
wkmap_clear(VALUE self)
{
    struct weakkeymap *w;
    TypedData_Get_Struct(self, struct weakkeymap, &weakkeymap_type, w);

    st_foreach(w->table, wkmap_free_table_i, 0);
    st_clear(w->table);

    return self;
}